YAML Formatter

Online tool for formatting YAML with indentation, syntax check, and clear error messages.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

YAML Formatter is a free online tool for formatting YAML configs with clear indentation and basic syntax validation. It is useful for Kubernetes manifests, Docker Compose, GitHub Actions, GitLab CI, and backend settings. Processing runs locally in your browser.

What it does

Output

Processing

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How to use

Paste a YAML config, Kubernetes manifest, Docker Compose, GitHub Actions, GitLab CI, or other YAML fragment.
Choose indent: 2 or 4 spaces, plus additional formatting options.
Click Format YAML and check syntax status.
Copy formatted YAML and additionally verify complex configs in a specialized tool before production use.

More about this tool

YAML Formatter helps bring YAML configs to a neat layout with clear indentation and checks basic syntax.

The tool is useful for Kubernetes manifests, Docker Compose, GitHub Actions, GitLab CI, CI/CD configs, backend settings, and dev files. You can choose 2 or 4 space indent, remove trailing spaces, preserve comments when possible, and get clear errors with line and column.

YAML is sensitive to indentation, so complex files with anchors, aliases, custom tags, and Helm templates should be verified in a specialized editor.

Processing runs locally in your browser.

Formats YAML with indentation
Checks basic syntax
Shows errors with line and column
Suitable for Kubernetes, Docker Compose, and CI/CD
Can remove trailing spaces
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the YAML formatter do?

It brings YAML to a more readable layout with neat indentation and checks basic syntax before output.

Why is YAML sensitive to indentation?

In YAML, indentation defines data nesting. An extra or wrong space can change config structure or make the file invalid.

Can I choose 2 or 4 space indent?

Yes. Settings let you format with 2 or 4 space indentation.

Are YAML comments preserved?

Comments can be preserved if the parser/stringifier supports it. If the library cannot preserve comments, the tool should show a hint about this limitation.

Is the service suitable for Kubernetes manifests?

Yes, for basic Kubernetes YAML formatting. It does not replace Kubernetes schema validation or check whether a manifest will apply in a cluster.

Is the service suitable for GitHub Actions and GitLab CI?

Yes, for basic CI/CD config check and alignment. Use specialized validators for workflow or pipeline rules.

Does the formatter fix broken YAML automatically?

No. The tool may show a syntax error but should not automatically guess structure and fix the config, to avoid distorting data.

How is the YAML formatter different from YAML to JSON converter?

The formatter works with YAML and returns YAML. The converter transforms YAML structure into JSON — a separate task.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

How to use

Paste a YAML config, Kubernetes manifest, Docker Compose, GitHub Actions, GitLab CI, or other YAML fragment.

Choose indent: 2 or 4 spaces, plus additional formatting options.

Click Format YAML and check syntax status.

Copy formatted YAML and additionally verify complex configs in a specialized tool before production use.

More about this tool

YAML Formatter helps bring YAML configs to a neat layout with clear indentation and checks basic syntax.

YAML is sensitive to indentation, so complex files with anchors, aliases, custom tags, and Helm templates should be verified in a specialized editor.

Processing runs locally in your browser.

Formats YAML with indentation
Checks basic syntax
Shows errors with line and column
Suitable for Kubernetes, Docker Compose, and CI/CD
Can remove trailing spaces
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the YAML formatter do?

It brings YAML to a more readable layout with neat indentation and checks basic syntax before output.

Why is YAML sensitive to indentation?

In YAML, indentation defines data nesting. An extra or wrong space can change config structure or make the file invalid.

Can I choose 2 or 4 space indent?

Yes. Settings let you format with 2 or 4 space indentation.

Are YAML comments preserved?

Comments can be preserved if the parser/stringifier supports it. If the library cannot preserve comments, the tool should show a hint about this limitation.

Is the service suitable for Kubernetes manifests?

Yes, for basic Kubernetes YAML formatting. It does not replace Kubernetes schema validation or check whether a manifest will apply in a cluster.

Is the service suitable for GitHub Actions and GitLab CI?

Yes, for basic CI/CD config check and alignment. Use specialized validators for workflow or pipeline rules.

Does the formatter fix broken YAML automatically?

No. The tool may show a syntax error but should not automatically guess structure and fix the config, to avoid distorting data.

How is the YAML formatter different from YAML to JSON converter?

The formatter works with YAML and returns YAML. The converter transforms YAML structure into JSON — a separate task.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.